Encryption Algorithms and Communication via A Symmetric Cipher Questions

Write answers in a word document:

  • What are the essential ingredients of a symmetric cipher?
  • What are the two basic functions used in encryption algorithms?
  • How many keys are required for two people to communicate via a symmetric cipher?
  • What is the difference between a block cipher and a stream cipher?
  • What are the two general approaches to attacking a cipher?
  • Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?
  • What is triple encryption?
  • Why is the middle portion of 3DES a decryption rather than an encryption?
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